光交叉连接器在光传输中的应用

目前以IP业务为代表的数据业务爆炸式增长,单信道传送速率从2.5Gb/s到10Gb/s到40Gb/s的快速增长,密集波分复用技术的使用,骨干网的电信级大容量快速交换需求,使得对光传送网交换节点的要求越来越高。网络的生存性、网络的恢复和自愈问题都变得非常重要。光交叉连接器（OXC）技术的发展,替代了复杂昂贵的电交叉连接,使空闲光纤数减少。同时,不需要光电转换,提供了比电交叉连接更高的交换效率。OXC能在光层解决网络恢复和自愈问题,极大地提高了网络的生存性和恢复速度。因此,光交叉连接器作为光传送网的关键设备,它的发展将对…     

光网络的核心器件—光交叉连接器

对于如此巨大的信息吞吐量(Tb/S级),和很高的入线速率(Gb/s级),必须对这样链状网络的重组、故障恢复、连接、调度等提出新的要求。早期的光交换是以电学为核心的,它是首先把光数据流转换成电数据,然后利用电交叉连接技术完成交叉连接,最后再把电数据流转换回光数据,我们把这种方式称之为混合交换。然而,这种光/     

光交叉连接器OXC的结构性能分析

OXC是实现全光网络的核心器件。本文介绍了光交叉连接(OXC)的结构原理，并分析了几种常见的OXC性能特点。最后介绍了—种简单的OXC结构，并用仿真的方法和其它OXC结构进行比较分析。     

光放大器在光传输系统中的应用

随着光网络的发展,特别是DWDM系统和超长传输的出现,利用光放大器直接对光信号进行放大的中继方式被运用到光纤传输系统中,这种方式能极大地延长传输距离,降低系统成本,使得整个系统更加简单、灵活、高效。     

DCC开销交叉技术在光传输网络中的应用

提出了一种利用DCC开销交叉技术建立DCC的解决方案,介绍了该方案的技术原理和实现途径,最后对该技术进行了测试验证,试验结果表明该技术方案是正确可行的。     

双向对称WDM光网络中光交叉连接器复杂度的降低

随着波分复用波长数量的增多及传输容量的快速增长 ,光交叉连接器的端口数目也相应地增加。利用低维光交叉连接器构建高复杂度的光交叉连接器 ,具有很大实用价值。文中针对波分复用传输系统中的双向对称系统 ,提出了一种降低 N× N光交叉连接器复杂度的方案 ,能实现完全连接的可重构无阻塞交换 ,与传统的 Benes交换模型相比 ,更为经济有效     

全光网的关键器件——光交叉连接器与光分插复用器

全光网（AON,all-optical network）以波长路由光交换技术和波分复用传输技术（WDM）为基础,它的网络节点由光分插复用器和光交叉连接器构成,能在光域上实现高速信息流的传输、交换、路由和故障恢复等功能。光交叉连接器（OXC）与光分插复用器（OADM）是全光网中最重要的网络器件,是真正实现全光网关键性功能的必要前提,也是目前国内外光通信器件厂商研究和开发的热点。本文结合全光网的发展,介绍了光交叉连接器（OXC）与光分插复用器（OADM）的基本原理、性能指标,对不同的节点结构进行了比较与讨论,并介绍与比较了目前国内外厂商的主要产品。     

光连接器的常见问题

有些常见问题经常被光纤用户提及。近来这些问题集中体现在陶瓷套圈连接器与MT套圈连接器之间的区别上。陶瓷套圈用于单纤应用的陶瓷套圈多年来一直没变。对于这种相对成熟的技术，主要制造商一直在容差、制造和检查过程方面进行精益求精的改善。陶瓷套圈产品有多种尺寸规格，ST、FC、SC连接器最常用的互连产品外部直径(OD)为2.5mm，小形状因数(SFF)MU和LC环形连接器所用的为1.25mm OD。光纤孔内径、同心度和容差常被用来表示所要实现的光性能和光纤参数。两个套圈的校准可在一个称为分离套管的陶瓷管内实现，陶瓷管位于与其连接器…     

Alcatel开发出无需光/电转换的全光交叉连接器

Ａｌｃａｔｅｌ公司于近日公布了省去光／电转换的全光交叉连接器（Ｃｒｏｓｓ Ｃｏｎ－ｎｅｃｔ）系统“ＣｒｏｓｓＬｉｇｈｔ”。 在Ｃｒｏｓｓ Ｌｉｇｈｔ中省去了光／电传换过程，并在光传输路径矩阵上直接切换路径，以光信号的形式决定路径。 在Ｃｒｏｓｓ Ｌｉｇｈｔ中，可以根据顾客的带宽要求增加容量或弹性分配带宽，与该公司的其他光网络产品组合后，可以建立统一管理的国有扩展性能的宽带交换系统。 Ｃｒｏｓｓ Ｌｉｇｈｔ可以实现自前世界最高级的开关容量，省去光／电转换过程，它可以降低４０％的网络成本。Alcatel开发出无…     

Wavelength-dependent transmission at fibre connectors

It is shown that the transmission loss of a fibre connector with a preceding fibre is extremely wavelength-dependent. A change of laser wavelength by only 0.01 ? may suffice to change the transmission by 10% when using typical multi-mode fibres.     

SC-type single-mode optical fiber connectors

SC-type single-mode optical fiber connectors specifically developed for subscriber loop networks are discussed. The properties and design of precision zirconia ceramic ferrules which have been found to be ideal for high-performance, low-cost single-mode optical fiber connectors are described. A design approach featuring a plastic-molded rectangular connector housing using a push-pull coupling mechanism which has also been found to be suitable for durable, compact, and low-cost connectors is presented. SC connectors used with 10/125 single-mode fibers exhibit insertion loss of 0.06 dB and return loss of 38.6 dB, with no degradation during and after mechanical and environmental tests. To realize higher packaging density, duplex-ferrule connectors, quadruple-ferrule connectors and optical attenuators have also been developed on the basis of the SC connector design     

Return loss characteristics of optical fiber connectors

This paper describes the return loss characteristics for four typical contact type connectors: perpendicular and oblique endface connectors employing either physical contact or contact via index matching material. The high index layer on the polished fiber endface and the index matching material, which are important connector parameters, are investigated by measuring the return loss from one perpendicular fiber endface coated with the material and by etching the fiber endface. It is useful to apply two materials with different refractive indices to derive the refractive index and thickness of high index layers on perpendicular fiber endfaces. The index matching material we use has a refractive index of 1.467 at 20°C and a thermal coefficient of -2.9×10^-4/°C at 1.3 μm. We performed return loss calculations and experiments of the four contact type connectors. The worst value at any temperature from -40 to 80°C can be estimated, by measuring the return loss of these connectors at room temperature     

光纤连接器:不仅适用于高速传输

目前光纤电路的应用范围不只是限于极远距离的高速率数据传输.标准的光纤连接器正在逐渐扩展其应用范围,从激光外科手术到水下摄像设备,从石油化工厂的外界环境到原子反应堆的内部,我们都可以找到光纤连接器的应用.本文的目的是想给刚进入光纤连接器领域的工程师们提供一些知识,帮助他们认识连接器的基本类型和安装风格,本文所介绍的内容可以为读者提供连接器性能和价格方面的参考.     

飞行器内的传输线与连接器电路串扰分析

对飞行器内的传输线与连接器级联结构的串扰进行了数值分析和实验研究.对于飞行器中的电缆与连接器布局问题,国内缺乏统一的规范,故电缆与连接器的电磁兼容特性,成为了研究的热点.从传输线矩阵模型入手,提出了连接器矩阵模型,通过矩阵的级联来体现实际结构.模拟表明:串扰幅度与各端接入的负载密切相关,结构间的相互距离同样对串扰存在影响.现场测试曲线验证了仿真的可靠性,对工程应用具有参考价值.     

Highly stable physical-contact optical fiber connectors withspherical convex ends

Highly stable physical-contact optical fiber connectors achieved by optimizing ferrule end structures are described. Ceramic ferrule material, the curvature radius of the ferrule endfaces, and the convex vertex eccentricity from the ferrule central axis were studied. On the basis of these studies, single-mode and multimode fiber connectors with stable low-insertion loss and high-return-loss characteristics were fabricated     

Subscriber optical fiber cable transfer splicing system usingmechanically transferable connectors

An optical fiber cable transfer splicing system is developed for use in removing or changing optical fiber cables. The system enables rapid transfer from existing optical fiber cables to newly installed ones. The transfer is carried out synchronously using two mechanically transferable connectors which terminate the optical fiber cables at two different points, such as manholes. Before the transfer splicing, the system identifies a fiber ribbon in order to avoid mistransfer. A transfer time of less than 30 ms was achieved. The fiber ribbon was identified with a loss, from an identification light source to an identification point, of 35.5 dB. With this system, cable transfer can be faultlessly carried out with only a slight interruption to working transmission systems and circuit quality degradation is suppressed     

下一代光传送网络中光转发单元的研究

文章研究了光转发单元(OTU)在下一代光传送网中的应用,并给出了一种基于ITU TG.709的OTU设计和工作流程[1].